12 lines
179 B
C
12 lines
179 B
C
|
#include "math.h"
|
||
|
|
|
||
|
|
inline uint32_t log2(const uint32_t x) {
|
||
|
|
uint32_t y;
|
||
|
|
// Get the highest set bit
|
||
|
|
asm ( "\tbsr %1, %0\n"
|
||
|
|
: "=r"(y)
|
||
|
|
: "r" (x)
|
||
|
|
);
|
||
|
|
return y;
|
||
|
|
}
|